Resilient attachment for well-casings.



W. G. VREELAND. RESILIENT ATTACHMENT F 0R WELL CASINGSA APPLlCAfION FlLhD MAY I8, 1917;' 1,269,282., Patented June 11, 1918.

WALTER G. VREELAND, 0F CHATTANOOGA, TENNESSEE, ASSIGNOR T0 LACEY MNNUFAG TUBING CORPORATION, OE' CHATTANOOG-A, TENNESSEE, A CORPORLTION @0F TEN- NESSEIIE.

RESIILIENT ATTACHMENT FOR WELL-CASINOS.

incassa.

Specification 'of Letters Patent'.

Patented dune ilil, 191e.

.application led may 12, 1917. Serial No. 169,549.

To all whom t may concern.'

Beit known that I, WALTER G. VREELAND, a citizen of the United States, residing lat Chattanooga, in the county of Hamilton and State of Tennessee, have invented certain new and useful Improvements in Resilient Attachments for Well-Casings, of which the following is a specification;

My invention relates to resilient attach ments especially for use in connection with casing rigs used in rotary well drilling.

VDuring the progress of well drilling, as the depth of the well increases, it is necessary to keep adding lengths of casing which necessitates a considerable amount of screwinf and unscrewing at the connecting joints.

,Great diiiiculties have been experienced on account of the weight of the upper members, which have to be raised to allow the insertion of the additional llengths of casing,

tending to bur the threads when the joint i is being coupled or uncoupled.

It is an object of my invention to provide an attachment which will hold the upper.

jointsin suspension and keep the connecting members *in alinement thereby eliminating the strain and wear on the threads while screwing or unscrewing the casing.

By using my device m a rotary well drilling outfit where a swivel is used, the swivel will be relieved of considerable strain when the drilling member comes into sudden contact with the bottom of the well thereby adding to the wearing qualities of the swivel.

t will also be found that with the use of my device the derrick and hoisting machinery is relieved of aconsiderable strain when the slack of the cable is taken up upon the hoisting of the casing,

With the above and other objects in view f which will appear as the nature of my invention is better understood, my invention consists in the novel features hereinafter described, illustrated in the accompanying drawings and more particularly pointed out in the appended claims.

Referrin to the drawings; l

Figure 1 1s a detail view of the attachment showing it attached to a casing hook and swivel. j

Fig. 2 is a side elevation of Fig. 1.

In the drawings 1 designates my attachment which is shown connected at 1ts top to 5E la casing or cable hook A, said hwk being stem 10, the

provided with a hole 11 12. The bail 13 straddles the upper end of the stem 8 and is provided with apertures to receive the projecting ends of said pintle 12. Pins 14; are provided through the pintle 12 to retain it in position.

The lower ends of the links 2 and 3 are apertured similar to the upper ends and receive the shaft 15 to which is connected the bail 16 and a spacing ring 17. The shaft l5 being held in relative position by means of the ins 18. j 4

The ower end of the stem 10 is threaded to receive the nut 19 which holds in lace a disk 20. The upper face of said 'sk is provided with a seat to which `is tted the sleeve 22 said sleeve serving as a partial housin for a compression spring 21 and as a resilient support for the ,lower bail 16 when the full load is attached.

In using my attachment While raising a well casing', the swivel Bis secured to the upperjend of the line while the bail 13 is connected to the cable hook A.. After the upper section of the casing is above the level of the table the .next section is gripped in the -usual manner for the pu ose of independently supporti the casing. As the casing is being lifte the spring 21 will be compressed until the sleeve 22 engages the crosshead and during the lifting the vweight of the rig will be supported by said sleeve. As the upper section of the casing is unscrewed from the casing proper, the spring 21 will expand causing the crsshead 6 to move upwardly thereby relieving the threads of the casing joints from the strainV incident to disconnecting the sections of the casing. During the removal of the upper section of the casing, the swivel B permits the uppersection to be turned while any lateral movement of the upper section and swivel will be accommodatedby the pivots' to receive the pintle of a swivel B.

upper end of said stem being w lnection between two of 12, 5 and l5. During drilling, the operation just described is reversed as will be apparent tos those skilled in the art.

While l have heroin shown and described a specific embodiment of my invention, it is to be understood that in practice, ll may resort to such modifications as fall within the scope of the invention as defined in the appended claims.

ll claim: i

l. A. resilient attachment for well rigs comprisingv upper and lower bails for conthe uppermembers of a well rig, links connected to said lower bail and'carrying a crosshead, a stem connected to the upper bail, resilient means interposed between the lower end of said stem and said crosshead adapted to carry the load supported from said lower bail and to return said lower bail to its normal position after a vertical movement thereof, and means to limit the downward movement of said lower bail and relieve the load on said resilient means when the latter has contracted a predetermined amount.

2. A resilient, ttachment for well rigs comprising upper and lower bails for connection between two oi? the upper members of a well rig, links pivotally connected to said lower bail and pivotally connected at their upper ends to a crosshead, a stem pivotally connected 'to the upper bail and passing through an aperture in" said crosshead, resilient means interposed between the lower end of said stem and said crosshead Vand adapted to carry the load supported from said lower bail and toireturn said lower bail to its normal position after tacones a verticalV movement thereof, and means to limit the downward movement of said lower bail and relieve the vload on said resilient means when the latter has contracted a predetermined amount.

3. A resilient attachment for well rige comprising upper and lower bails for con nection between two of the upper members ot a well rig, an apertured cross-head, links pivotally connected at their lower ends to said lower bail and pivotally .connected at their upper ends to said apertured crosshead, a stem carried by the upper bail eirtending through the aperture of the crosshead and provided at its lower end with a disk, and a spring interposed between said crosshead and said disk.

4. A resilient attachment for well rigs comprising upper and lower bails for connection between two of the upper members of a rig, an apertured cross-head, links pivotally connected lat their lower ends to said lower bail and pivotally connected to the upper ends of said apertured cross-head, `a stem pivotally connected to the upper bail eXtending through the aperture of said crosshead and provided at it lower end with a disk, a sleeve carried by said disk, and a spring interposed between said erosshead and said disk.

ln witness whereof ll set my hand and a'HiX my signature in the presence of two subscribing witnesses.

warren e. vnnnnann.

Witnesses:

H. L. 'llnaromnrr7 S. Pattensen.

@oplet et 'this patent may te obtained tor nve cents each, ty addressing the Commissioner et' repente, Wilaehimgten, will. 

